What is vitamin A

What is vitamin A
Vitamin A is a lipid-soluble material, its digestion and absorption need participation of mineral and fat, can store in the body, does not need supplementing every day. There are two kinds of vitamin A: One kind is vitamin A alcohol, it is a initial vitamin A shape, only exist in the animal food; Another kind is carrotene, change into becoming the material in advance of vitamin A in the body, can absorb from plant and animal food.
Propose the sun absorbing amount:
As for general adult man, 5000 IU (international unit) ( 1 IU =0.3ug ) Can prevent from insufficiently; Women need 4000 IU. During pregnancy, it is not proposed increasing that the latest suggestion is absorbed; But you are it nurse mother,in before can increase extraly by 2500 IU in 6 month,but in after 6 pieces if you can't reduce on the month to, it is extra that if you can't take a photograph of, fetch by 2000 IU.
Supplement cycle:
Propose supplementing every day.
Food source:
Yellowish green vegetables, yellow fruit, eggs, milk, milk product, cod liver oil,etc. such as the liver, carrot, white turnip,etc..
Need crowds:
The absorption of the fat is bad for a long time, such as suffering from digestive tract disease, person who excises part of intestines and stomach, will often result in lacking vitamin A. This kind of situation often takes place on child under the age of 5, mainly because the uptake amount of the diet is insufficient. Vitamin A in wearing the contact lenses or person that must watch the computer screen attentively for a long time for a long time, more important nutrient. Pregnant woman and women breast-feeding their children need vitamin A very much.
Deficiency disease:
Lack vitamin A seriously for a long time, will cause dry eyes and even can result in losing one's sight.
Excessive to behave:
Unusually allergic, symptom of generating heat, suffering from diarrhoea, dizzy etc., and the above-mentioned symptom will appear after ultra quantity is taken for 6 hours.
The editor recommends:The content of vitamin A of the tomato is abundant
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